I am pretty sure this can be done but it needs a bit of JavaScript to make it work and I am not that good at JavaScript. I am asking "when did you arrive here" with numerical boxes for year and month. I need to calculate how many years/months or months that have elapsed and present it as as "pop up" box below the question. This will have 2 radios in it to say is this correct y/n, if the response is no another "pop up" box will appear below that to say change the dates above. Any help with the JavaScript would be much appreciated.